Desert Museum Palo Verde tree (3-way hybrid with: Parkinsonia aculeata, P. microphylla, and P. florida)
Blue Palo Verde. After flowering it produces pods with edible seeds that look, and apparently taste, like shelled edamame.
Palo Verde Trees. For Q&A: http://latimesblogs.latimes.com/home_blog/2011/08/palo-verde-desert-museum.html 4 species - important to know when choosing which one to plant. http://cals.arizona.edu/mohave/master_gardeners/lake_havasu/articles/paloverdetrees.pdf